Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd0ee0e4611e8b1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 07:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 961d5d8da5190d4a198b3d121ad3f5ef SHA-1: 6d67042e130aada8a7c0a320b120c011cc3b6a0c SHA-256: 4dd0ee0e4611e8b124d3909c8a2769dd9eb8732aab0589137e48ce07248a089a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The numerous extracted URLs, many hosted on compromised CMS platforms, suggest an attempt to direct users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=female+red+tailed+hawk PDF link annotation
    • http://s8radziejowice-paszkow.pl/userfiles/file/91434443732.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/suwujez.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/aacd649ac6d068a6240271c1e0a69067/13893829430.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/a2s284a12f50nhj627ucraecu7/2822790302.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a80448d389---gujusibi.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/29379279292.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bulubamatifimepexavugo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5b7bc86e---rakoruwipavasiwab.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/dapozokuwages.pdfIn PDF document text
    • http://all-premium.com/user_file/files/72736121885.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b2eb0a8c8---fomavejuvo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/46375130167.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/62408157157.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/27536961758.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f8d50a745---96095438073.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3dd234f59bd61cc85e857145c5115273/bokitutupuvemofatid.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb79913c9---83299814435.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f04731122---delotuwijaruvuse.pdfIn PDF document text
    • http://yoron.net/up/files/32081622059.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/24375147759.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41a1076703---17532632542.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/jiginixasoxebew.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10276 bytes
SHA-256: 02a7e93d923d840d40f1fe09114b8957f38fae0c273e0c11f341982ad18a9751
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 19412 bytes
SHA-256: f864c514065a64f282ea191696c003f15e16664a151e59dd2c545c01018d5234
font_02_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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